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• General records of the Government Code and Cypher School

  Held by

  Date

  1914-1979

  Reference

• Government Code and Cypher School: Sigint Board and predecessors: Correspondence...

  Held by

  The National Archives, Kew

  Date

  1940-1945

  Reference

  HW 69

• Security. Cooperation with United States. P/YB/113/AA1 Security ULTRA - USA, SEAC...

  Held by

  The National Archives, Kew

  Date

  1942 Jul 07 - 1945 Aug 05

  Reference

  HW 69/9

• Decrypts of medium/low grade German naval cypher messages

  Held by

  The National Archives, Kew

  Date

  1942 Aug 21-1942 Oct 12

  Reference

  HW 18/69

• Decrypts of intercepted diplomatic communications. Afghanistan: 20134, 20157, 20175,...

  Held by

  The National Archives, Kew

  Date

  1925 Apr

  Reference

  HW 12/69

• Reports in the series VM/2751 to VM/3000.

  Held by

  The National Archives

  Date

  1943 Jan 29-1943 Feb 01

  Reference

  HW 20/69

• CY/53/A RSS [Radio Security Service] Personnel India. YB/53/B RSS GP's [Gambier-Parry]...

  Held by

  The National Archives, Kew

  Date

  1944 Feb 04 - 1944 Aug 12

  Reference

  HW 69/15

• DD (S) to EWT on future development of Sigint channels for new areas with recommendations,...

  Held by

  The National Archives, Kew

  Date

  1943 Mar 1-10

  Reference

  HW 14/69

• Personnel Review in Sigint Service. 'Y' [Sigint] Board file containing correspondence...

  Held by

  The National Archives, Kew

  Date

  1944 Oct 10 - 1945 May 18

  Reference

  HW 69/4

• Security South Africa. 'Y' [Sigint] Board file reflecting security reservations about...

  Held by

  The National Archives, Kew

  Date

  1943 May 27 - 1943 May 28

  Reference

  HW 69/7

• Security - Australia 1943-1945. P/YB/113/HH Security ULTRA - Australia. YB/113/0...

  Held by

  The National Archives, Kew

  Date

  1943 Apr 22 - 1945 Jul 08

  Reference

  HW 69/12

• Commercial reports

  Held by

  The National Archives, Kew

  Date

  1940 Dec 01-1940 Dec 09

  Reference

  HW 29/69

• GCCS pensioner telegraphists' salaries

  Held by

  The National Archives, Kew

  Date

  1939

  Reference

  HW 3/69

• German section: reports of German army and air force high grade machine decrypts

  Held by

  The National Archives, Kew

  Date

  Mar 3 1942-Mar 6 1942

  Reference

  HW 5/69

• Comintern messages: Communist Party of Great Britain, LONDON and BERLIN

  Held by

  The National Archives, Kew

  Date

  1930 Mar 5-1931 Apr 2

  Reference

  HW 17/69

• Administraive signals

  Held by

  The National Archives, Kew

  Date

  1943 Mar 29-1943 May 07

  Reference

  HW 41/69

• Bulgarian State Security and National Militia messages including reports on agents...

  Held by

  The National Archives, Kew

  Date

  1947 Sep 17 - 1947 Oct 16

  Reference

  HW 75/69

• Signals concerning access to Ultra messages

  Held by

  The National Archives, Kew

  Date

  1941 Apr 13 - 1943 Dec 13

  Reference

  HW 51/69

• Decrypts of Japanese army and army air force messages

  Held by

  The National Archives, Kew

  Date

  1945 Jun 15-1945 Aug 10

  Reference

  HW 52/69

• Reports of Japanese army air decryots with subject headers

  Held by

  The National Archives, Kew

  Date

  1945 Apr 03-1945 Jun 08

  Reference

  HW 28/69